code: def test_chunked_stream(self):
      def random_bytes(n):
          return bytearray(random.getrandbits(8) for _ in range(n))
  
      for data_length in [1, 10, 100, 10000]:
          for buffer_length in [1, 2, 5, 8192]:
              self._test_chunked_stream(
                  random_bytes(data_length), buffer_length
              )
  
imports: import os
  import pickle
  import random
  import time
  import tempfile
  import unittest
  from py4j.protocol import Py4JJavaError
  from pyspark import SparkConf, SparkContext, Broadcast
  from pyspark.java_gateway import launch_gateway
  from pyspark.serializers import ChunkedStream
  from pyspark.sql import SparkSession, Row
label_desc: Use image node_id 3 for calling the BroadcastFrameProtocolTest obj's underlying member method code with example usage: obj.test_chunked_stream() and returns: bytearray